1975 Historical California Counties Map
1975 Historical California Counties Map
Why would you want to see historical Google Maps? County boundaries in the U.S. have changed over 17,600 times since America was settled in colonial times! This historical counties tool built on Google Maps will help you make sure you’re searching in the correct county for the place and any historical date you are researching. Research with confidence knowing that this tool is built using the complete dataset of the authoritative Newberry Library’s Atlas of Historical County Boundaries project.
Quick Tips for using this 1975 Historical California Counties Map tool
- There are four ways to get started using this Historical U.S. Counties map tool
- Type any PRESENT-day place or address in the “Search places” box above the map and choose the one you want from the auto-complete list
- Click the map to see the historical county name for where you clicked (Monthly Contributors also get Dynamic Maps)
- To search using GPS coordinates use the “Find lat long” box in the top right above the map*
- Click the ◉ button in the upper right corner of the map to use your current location. Click the ◉ button again to automatically update your location every 1, 5 or 10 minutes (Monthly Contributors also get an option to update every several seconds, shown as ◉A for Active).**
Historical county boundaries will draw, and an information pane about the county of interest will appear at the top of the map. The information pane lists the historical county name at the blue dot, and provides details on the latest boundary change as of the date you typed, including reference to the particular statute that triggered the change. The latitude and longitude for the blue dot is also displayed.
- Optionally, check the “Show historical county labels” checkbox in the lower left corner of the map to see the names of the historical counties on the map
- Check the “Show county chronology of this place…” checkbox in the lower left corner of the map to see a complete listing of every county boundary change for your chosen location from the date you typed back in time to original county formation
- Optionally, show present-day counties (thin red lines) and present-day townships (dark orange lines) by checking the boxes in the lower left corner of the map. If you have historical county labels checked and are also showing present-day townships, then township labels will also draw.
- Subscribe to receive notification of tool updates and usage tips
* You can search using various formats of latitude longitude, including degrees, minutes and seconds; degrees
and decimal minutes; or decimal degrees
** The “Locate” button will be more accurate on smartphones and other devices containing a GPS; desktop browsers typically show an approximate location
Why would you need a map with historical county boundaries?
Here are several example uses for historical U.S. counties on Google Maps:
- Genealogical Research: While tracing your family tree, pinpoint where your ancestors lived and understand how county changes might have affected them.
- Archival Searches: If you’re delving into historical records, knowing the pertinent county during the time in question ensures you’re searching in the right archives or courthouses.
- Land and Property Lineage: Understand the context of historical ownership changes of a piece of land or property over the years, especially if county borders shifted.
- GPS Coordinate Historical Context: For specific GPS points, understand which county they would have fallen under at any given past date.
- Historical Address Verification: Determine the specific county of a present-day address during a past era, aiding in accurate historical context and study.
- Academic and Educational Insights: Teachers, students, and researchers can better grasp county evolution, aiding in geography, history, and social studies education.
- Infrastructure and Urban Planning: Urban planners can consider historical county boundaries when assessing older infrastructure, roads, and city development patterns.
- Cultural and Community Evolution: Understand the historical narratives, events, and shifts that influenced community changes over time.
- Legal and Land Dispute Clarification: Provide context to historical legal disputes or issues rooted in historical county demarcations and jurisdictional changes.
- Environmental and Ecological Studies: Researchers can trace environmental changes, land use, and conservation efforts in relation to historical county boundaries.
- Historical Tourism and Exploration: Travelers keen on exploring historical sites can gain context about the county boundaries that existed during significant events or eras.
- Economic and Societal Analysis: Economists and sociologists can study past county-based data to understand economic shifts, migrations, and societal changes.
Looking for PRESENT-day county boundaries on Google Maps? Here it is: County Lines tool.
Find Historical Counties by radius or by drawing a line or shape
- To find Historical Counties within a radius or near a line or shape you draw*:
- Click the “Selection Tools” button in the lower left corner of the map
- – RADIUS SELECT: To find Historical Counties within a radius, specify the mileage in the “Select map features within x
miles of the shapes I draw” box, then use the Point “Add a marker” tool to draw a point in the middle of
– TOUCHING A LINE OR SHAPE: To find Historical Counties that touch a line or a shape you draw, use the Line tool or Shape tool to draw the shape, double-clicking when finished
– WITHIN DISTANCE OF A LINE OR SHAPE: To find Historical Counties that are within a distance of a line or a shape you draw, first specify the mileage in the “Select map features within x miles of the shapes I draw” box, then use the Line tool or Shape tool to draw the shape, double-clicking when finished
- The Historical Counties will be highlighted and listed in a “Results from map” box below the map, where
you can copy the selected Historical Counties for use in a spreadsheet or other document
– Optionally, keep drawing shapes to select more Historical Counties
- When you are finished selecting Historical Counties, click the “DONE Selecting” button in the lower left corner of the map
* Historical Counties for the date or year you have specified in the “As of” date box will get selected if any part of the shape you draw falls within the historical county boundaries
FAQs for 1975 Historical California Counties Map
Why was this tool created? Many people have requested to be able to see historical county lines from the Newberry Library’s Atlas of Historical County Boundaries displayed on top of Google Maps.
While some other tools can show the Newberry Atlas in GIS formats for Google Earth, requiring downloads and installation, this free tool shows the entire Newberry Atlas of Historical County Boundaries overlaid on Google Maps in a web browser. Therefore, you don’t have to download, install or import anything, and you can even use it on your smart phone or tablet.
Coverage Notes– Coverage includes all 50 US states, from as early as 3/4/1629 through 12/31/2000. For present-day county lines use the County Lines on Google Maps tool.
- The Search places box uses a standard Google Maps geocoding engine, therefore you can type PRESENT-day street addresses, road names, points of interest, etc. to see what historical county that present-day location was part of as of the historical date you specified
- NEW! Some counties or regions were claimed by more than one jurisdiction in some historic years. When this is the case, an “Overlapping jurisdiction” button will appear at the top of the map enabling you to toggle to the other jurisdiction’s information.
- The map layers from which this information is extracted are very large, so it may take several seconds to finish drawing
- Note that typing an address will zoom in the map very close, whereas typing a city or county by itself will show you a map with a wider view
- Disclaimer: While the number of decimals in the latitude and longitude displayed for the map marker may imply a positional accuracy of within a few feet, note that Google Maps and the source data may not be that accurate. Accordingly, this tool should not be used for legal nor surveying purposes or anything beyond entertainment value.
Sources– Atlas of Historical County Boundaries, a project of The Dr. William M. Scholl Center for American History and Culture at The Newberry Library in Chicago, Illinois. The information is included in this tool under the Creative Commons license shown on the bottom of the linked page.
– US Census Bureau
Have a genealogy blog or website? Create your own custom link to this Historical U.S. Counties Map for any year and place
Listing of all Historical U.S. County Boundary Maps by state and year